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Bobo is a Faceted Search implementation written purely in Java, an extension of Apache Lucene

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/**
 * 
 */
package com.browseengine.bobo.facets;

/**
 * This interface is intended for using with RuntimeFacetHandler, which typically
 * have local data that make them not only NOT thread safe but also dependent on
 * request. So it is necessary to have different instance for different client or
 * request. Typically, the new instance need to be initialized before use.
 * @author xiaoyang
 *
 */
public interface RuntimeFacetHandlerFactory> {
  /**
   * @return the facet name of the RuntimeFacetHandler it creates.
   */
  String getName();

  /**
   * @return if this facet support empty params or not.
   */
  boolean isLoadLazily();

  /**
   * @param params the data used to initialize the RuntimeFacetHandler.
   * @return a new instance of 
   */
  F get(P params);
}